Vortices in self-bound dipolar droplets
Abstract
Quantized vortices have been observed in a variety of superfluid systems, from He to condensates of alkali-metal bosons and ultracold Fermi gases along the BEC-BCS crossover. In this article we study the stability of singly quantized vortex lines in dilute dipolar self-bound droplets. We first discuss the energetic stability region of dipolar vortex excitations within a variational ansatz in the generalized nonlocal Gross-Pitaevskii functional that includes quantum fluctuation corrections. We find a wide region where stationary solutions corresponding to axially-symmetric vortex states exist. However, these singly-charged vortex states are shown to be unstable, either by splitting the droplet in two fragments or by vortex-line instabilities developed from Kelvin-wave excitations. These observations are the results of large-scale fully three-dimensional simulations in real time. We conclude with some experimental considerations for the observation of such states and suggest possible extensions of this work.
Cite
@article{arxiv.1710.08725,
title = {Vortices in self-bound dipolar droplets},
author = {André Cidrim and Francisco E. A. dos Santos and Emanuel A. L. Henn and Tommaso Macrì},
journal= {arXiv preprint arXiv:1710.08725},
year = {2018}
}
Comments
6 pages, 3 figures